Chul S. Hyun, MD, PhD, MPH

Dr. Chul S. Hyun is a gastroenterologist with expertise in gastrointestinal and liver diseases, with a special focus on the prevention, early detection, and management of gastric cancer.

As the inaugural Director of the Gastric Cancer Prevention and Screening Program at Yale School of Medicine—the first program of its kind at an academic institution in the United States—Dr. Hyun leads efforts that span clinical care, education, research, implementation science, and policy advocacy. His work is rooted in reducing disparities in care for gastric cancer through innovative, community-anchored strategies and migration-informed risk assessment.

“I was drawn to gastroenterology because it brings together nearly every branch of medicine—physiology, immunology, endocrinology, infectious diseases, oncology, and more,” Dr. Hyun says. “In fact, I started out in basic science, studying ion transport in intestinal epithelial cells, so the move into GI was a natural evolution.”

Dr. Hyun is passionate about connecting with patients and communities on a human level. “My goal is to empower patients with knowledge and ensure they feel supported every step of the way,” he says. “I want people to see me not just as a physician, but as another human being—someone who’s genuinely interested in getting to know them and improving their health.”

“What I value most about this work is the opportunity to make a lasting difference—whether it’s through direct patient care, community education, or pushing for systemic change,” Dr. Hyun says. “Watching these efforts translate into real-world impact is what keeps me motivated every day.”

Dr. Hyun earned his undergraduate degree from Johns Hopkins University and his medical degree from the University of Miami School of Medicine. He completed his internal medicine residency at Georgetown University Medical Center and a fellowship in gastroenterology at Yale School of Medicine. He also holds a PhD in Biophysics from the University of Rochester, followed by a postdoctoral fellowship in cell physiology at the University of Chicago, and a Master of Public Health from Columbia University.